All downloads contain the same latest program version. The compilation for Windows 98 cannot process Asian fonts.

Installation: The downloads with installer create a desctop icon (shortcut).
The other downloads are the actual program, which is run with a double click. If required you can create a shortcut, e.g. a desktop icon, yourself.
You can also install Anti-Twin on a USB memory stick and start the program from there (Stickware/PortableApps).